////
//// Created by shenlf on 2021-12-25.
////
//
//#include <iostream>
//
//using namespace std;
//
//int reused = 42;
//
//int main() {
//    int unique = 0;
//    cout << reused << " " << unique << endl;
//    int reused = 0;
//    cout << reused << " " << unique << endl;
//    cout << ::reused << " " << unique << endl;
//    return 0;
//}